Size and weight is a big decision factor when you are trying to find the ideal camera for your needs.
In this section, We are going to illustrate Nikon D80 and Fujifilm S1500 side-by-side from the front, back and top in their relative dimensions. Nikon D80 has external dimensions of 132 x 103 x 77 mm (5.2 x 4.06 x 3.03″) and weighs 668 g (1.47 lb / 23.56 oz) (including batteries). Fujifilm S1500 has external dimensions of 103 x 73 x 68 mm (4.06 x 2.87 x 2.68″) and weighs 345 g (0.76 lb / 12.17 oz) (including batteries).
Below you can see the front view size comparison of Nikon D80 and Fujifilm S1500. Fujifilm S1500 is clearly the smaller of the two cameras. Its body is 29mm narrower, 30mm shorter and 9mm thinner than Nikon D80. As you can tell, actually this is not a fair size comparison since Fujifilm S1500 has a built-in lens but Nikon D80 doesn't. Once you put a lens on D80, its thickness will increase significantly.
Comparison image of Nikon D80 and Fujifilm S1500 Size, Weight and External Dimensions - Front View
Now lets look at the top view comparison of Nikon D80 and Fujifilm S1500.
Top View Comparison image of Nikon D80 and Fujifilm S1500 Size
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Fujifilm S1500 is significantly lighter (323g ) than the Nikon D80 which may become a big advantage especially on long walking trips.
Again, this comparison may not be very useful in real life as we are comparing the weight of a camera with a built-in lens to the body-only weight of an interchangeable lens camera. Once you put a lens on D80, the total kit will weigh much higher.
Weather Sealing
Unfortunately neither Nikon D80 nor Fujifilm FinePix S1500 provides any type of weather sealing in their body, so you have to give extra care especially when you are shooting outdoors. If weather sealing is a must-have feature for you, check these sections: Top DSLR Cameras with Weather Sealing Top Bridge Cameras with Weather Sealing
LCD Screen Size and Features
Fujifilm S1500's 2.70" LCD screen is slightly larger than Nikon D80's 2.5" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.